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BCM48BF040T200B00 Datasheet(PDF) 11 Page - Vicor Corporation

No. de pieza BCM48BF040T200B00
Descripción Electrónicos  Fixed Ratio DC-DC Converter
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Fabricante Electrónico  VICOR [Vicor Corporation]
Página de inicio  http://www.vicorpower.com
Logo VICOR - Vicor Corporation

BCM48BF040T200B00 Datasheet(HTML) 11 Page - Vicor Corporation

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BCM® Bus Converter
Rev 1.2
vicorpower.com
Page 11 of 18
07/2015
800 927.9474
x040 200
y
B
48
BCM
B00
9.0 SINE AMPLITUDE CONVERTER™ POINT OF LOAD CONVERSION
The Sine Amplitude Converter (SAC™) uses a high frequency
resonant tank to move energy from input to output. (The
resonant tank is formed by Cr and leakage inductance Lr in the
power transformer windings as shown in the BCM module
Block Diagram. See Section 8). The resonant LC tank, operated
at high frequency, is amplitude modulated as a function of
input voltage and output current. A small amount of
capacitance embedded in the input and output stages of the
module is sufficient for full functionality and is key to achieving
power density.
The BCM48BF040T200B00 SAC can be simplified into the
preceeding model.
At no load:
VOUT = VIN K
(1)
K represents the “turns ratio” of the SAC.
Rearranging Eq (1):
K=
VOUT
(2)
VIN
In the presence of load, VOUT is represented by:
VOUT = VIN K – IOUT ROUT
(3)
and IOUT is represented by:
IOUT =
IIN –IQ
(4)
K
ROUT represents the impedance of the SAC, and is a function of
the RDSON of the input and output MOSFETs and the winding
resistance of the power transformer. IQ represents the
quiescent current of the SAC control, gate drive circuitry, and
core losses.
The use of DC voltage transformation provides additional
interesting attributes. Assuming that ROUT = 0 Ω and IQ = 0 A,
Eq. (3) now becomes Eq. (1) and is essentially load
independent, resistor R is now placed in series with VIN.
The relationship between VIN and VOUT becomes:
VOUT = (VIN –IIN R) K
(5)
Substituting the simplified version of Eq. (4)
(IQ is assumed = 0 A) into Eq. (5) yields:
VOUT = VIN K – IOUT R K2
(6)
+
+
VOUT
COUT
VIN
V•I
K
+
+
CIN
IOUT
RCOUT
IQ
ROUT
RCIN
100 mA
1/12 • IOUT
1/12 • VIN
2.4 m
Ω
RCIN
0.57 m
Ω
286 pH
0.35
Ω
RCOUT
130 µ
Ω
200 µF
LOUT = 600 pH
2 µF
IQ
LIN = 5.7 nH
IOUT
ROUT
VIN
VOUT
R
SAC
K = 1/32
Vin
Vout
+
VIN
VOUT
R
SAC™
K = 1/12
Figure 14 — K = 1/12 Sine Amplitude Converter™
with series input resistor
Figure 13 — VI Chip
® module AC model
COUT
CIN


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